APG DCU-1100 user manual - Manual (Page 21)

Rev. A2, 11/06 DCU-1104 and DCU-1108
21
Automation Products Group, Inc.
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Utilities
Temperature Compensation
As air temperature changes, so does the speed of sound. This change can
cause 0.1% drift in distance for every °F change. Mode 24 allows compensation
for this change. The DCU-11 contains an internal thermistor which measures
temperature. By turning temperature compensation ON, the effects of
temperature changes may be reduced by 50% or better.
MODE DESCRIPTION PARAMETERS
24 Temperature Range = OFF/ ON, Temp in °C
Compensation Default = OFF
Selects internal temperature compensation for changes in the speed of sound.
Set to ON, OFF, or VIEW sensor temperature.
EXAMPLE:
Temperature Compensation is turned ON by pressing the VALUE UP button
when in Mode 24. Pressing the VALUE UP button one more time will display
the present temperature of the sensor in Fahrenheit. Place this mode in the ON
position if temperature compensation is desired.
For the DCU-11 temperature sensor to operate properly, it must be shielded
from direct sun radiation. Because the temperature sensor is internal to the
DCU-11, it requires several minutes to react to air temperature changes.
Reset
MODE DESCRIPTION PARAMETERS
25 Reset Range = No/Yes
Default = No
Reset the mode parameters to their factory preset values (default).
EXAMPLE:
When the DCU-11 is powered up, NO is loaded in Mode 25. This saves the
user-selected modes into the DCU-11. If the factory preset values are wanted,
press the VALUE UP button to load YES in Mode 25. If YES is entered, the
DCU-11 will perform a reset when the mode UP or mode DOWN key is
pressed, loading all the modes with the default parameters.